Meaning of crossOriginIsolated property
April 25, 2026•85 words
I've wondered what the crossOriginIsolated property is on browsers and why it is only emitted when the properties Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy are set. After diving into it I've come up with what I believe is the reason. But first allow me to give a little context.
The internet was taken by storm when two vulnerabilities, Meltdown and Spectre, that affected nearly all devices online suddenly dropped. They are speculation attacks that can allow an attacker to read ...
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